MonoGdx.Graphics.G2D.NinePatch.Add C# (CSharp) Method

        private int Add(TextureRegion region, Color color)
        {
            if (Texture == null)
                Texture = region.Texture;
            else if (Texture != region.Texture)
                throw new ArgumentException("All regions must be from the same texture");

            float u = region.U;
            float v = region.V2;
            float u2 = region.U2;
            float v2 = region.V;

            _vertices[_index + 0].Color = color;
            _vertices[_index + 0].TextureCoordinate = new Vector2(u, v);

            _vertices[_index + 1].Color = color;
            _vertices[_index + 1].TextureCoordinate = new Vector2(u, v2);

            _vertices[_index + 2].Color = color;
            _vertices[_index + 2].TextureCoordinate = new Vector2(u2, v2);

            _vertices[_index + 3].Color = color;
            _vertices[_index + 3].TextureCoordinate = new Vector2(u2, v);

            _index += 4;

            return _index - 4;
        }